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Abstract

Radiation-induced attenuation (RIA) in four types of polarization-maintaining
optical fibers for interferometric fiberoptic gyroscope (IFOG) at 1310 nm is
measured. The measurements are conducted during and after steady-state ?-ray
irradiation using a 60Co source in order to observe significantly different RIA
behavior and recovery kinetics. Mechanisms involving dopants and manufacturing
process are introduced to analyze the RIA discrepancy as well as to guide the choice
and hardening of optical fibers during the design of IFOG. Medium-accuracy IFOG
using Ge-F-codoped fiber and pure silica core fiber can survive in the space
radiation environment.

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